{"id":1014,"date":"2026-04-17T23:32:19","date_gmt":"2026-04-18T03:32:19","guid":{"rendered":"https:\/\/www.songhaiflange.com\/?p=1014"},"modified":"2026-04-17T23:43:05","modified_gmt":"2026-04-18T03:43:05","slug":"flange-facing-types-rf-ff-rtj-mfm-tg-sealing-surface-comparison","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/zh\/2026\/04\/17\/flange-facing-types-rf-ff-rtj-mfm-tg-sealing-surface-comparison\/","title":{"rendered":"\u6cd5\u5170\u9762\u7c7b\u578b RF FF RTJ MFM TG \u5bc6\u5c01\u9762\u6bd4\u8f83"},"content":{"rendered":"<h2>Flange Facing Types Explained<\/h2>\n<p>The flange facing (sealing surface) is critical for creating a leak-tight joint. Different facing types are designed for specific pressure ranges, temperatures, and sealing requirements.<\/p>\n<h3>\u51f8\u9762 (RF)<\/h3>\n<p><strong>Most Common Type<\/strong><\/p>\n<ul>\n<li>Raised sealing surface (1.6mm or 6.4mm height)<\/li>\n<li>Concentric or spiral serrations for gasket grip<\/li>\n<li>Suitable for Class 150-2500<\/li>\n<li>Works with soft, semi-metallic, and metallic gaskets<\/li>\n<li><strong>\u5e94\u7528\uff1a<\/strong> General service, oil and gas, chemical processing<\/li>\n<\/ul>\n<h3>\u5e73\u9762 (FF)<\/h3>\n<p><strong>Full Surface Sealing<\/strong><\/p>\n<ul>\n<li>Entire flange face is sealing surface<\/li>\n<li>Requires full-face gasket<\/li>\n<li>Limited to Class 150 and Class 300<\/li>\n<li>Prevents flange bending under bolt load<\/li>\n<li><strong>\u5e94\u7528\uff1a<\/strong> Low-pressure water, cast iron flanges, plastic-lined systems<\/li>\n<\/ul>\n<h3>\u73af\u5f62\u63a5\u5934 (RTJ)<\/h3>\n<p><strong>High Pressure Metal-to-Metal Seal<\/strong><\/p>\n<ul>\n<li>Groove for metal ring gasket (oval or octagonal)<\/li>\n<li>Metal-to-metal contact for superior sealing<\/li>\n<li>Suitable for Class 600 and above<\/li>\n<li>Handles extreme temperatures and pressures<\/li>\n<li><strong>\u5e94\u7528\uff1a<\/strong> High-pressure steam, oil and gas wellheads, refineries<\/li>\n<\/ul>\n<h3>\u7537\u6027-\u5973\u6027\u9762\u5b54 (MFM)<\/h3>\n<p><strong>Self-Aligning Sealing<\/strong><\/p>\n<ul>\n<li>One flange has raised male portion, other has recessed female<\/li>\n<li>Gasket sits in female recess for better alignment<\/li>\n<li>Reduced gasket blowout risk<\/li>\n<li><strong>\u5e94\u7528\uff1a<\/strong> Pump and valve connections, heat exchangers<\/li>\n<\/ul>\n<h3>Tongue-Groove Face (TG)<\/h3>\n<p><strong>Premium Sealing Performance<\/strong><\/p>\n<ul>\n<li>Tongue on one flange fits into groove on mating flange<\/li>\n<li>Excellent gasket containment<\/li>\n<li>Superior sealing for hazardous media<\/li>\n<li>Higher cost due to precision machining<\/li>\n<li><strong>\u5e94\u7528\uff1a<\/strong> Toxic gases, high-pressure hydraulic systems<\/li>\n<\/ul>\n<h3>Facing Selection Guide<\/h3>\n<table>\n<tr>\n<th>Facing Type<\/th>\n<th>Pressure Range<\/th>\n<th>Temperature<\/th>\n<th>Cost<\/th>\n<\/tr>\n<tr>\n<td>\u5e73\u9762 (FF)<\/td>\n<td>Low (Class 150-300)<\/td>\n<td>Moderate<\/td>\n<td>Low<\/td>\n<\/tr>\n<tr>\n<td>\u51f8\u9762 (RF)<\/td>\n<td>Medium-High (Class 150-2500)<\/td>\n<td>Wide<\/td>\n<td>Medium<\/td>\n<\/tr>\n<tr>\n<td>MFM<\/td>\n<td>Medium-High<\/td>\n<td>Wide<\/td>\n<td>Medium-High<\/td>\n<\/tr>\n<tr>\n<td>TG<\/td>\n<td>High<\/td>\n<td>Wide<\/td>\n<td>High<\/td>\n<\/tr>\n<tr>\n<td>RTJ<\/td>\n<td>Very High (Class 600+)<\/td>\n<td>Extreme<\/td>\n<td>High<\/td>\n<\/tr>\n<\/table>\n<h3>Gasket Compatibility<\/h3>\n<ul>\n<li><strong>RF\/FF:<\/strong> Non-asbestos, graphite, PTFE, spiral wound<\/li>\n<li><strong>RTJ:<\/strong> Soft iron, stainless steel, Inconel ring gaskets<\/li>\n<li><strong>MFM\/TG:<\/strong> Sheet gaskets, spiral wound with centering ring<\/li>\n<\/ul>\n<p>Choosing the correct flange facing type is essential for ensuring leak-free operation and optimal sealing performance in your piping system.<\/p>\n<p><strong>WhatsApp\uff1a<\/strong>\u00a0+86-18658777855<br \/>\n<strong>\u7535\u5b50\u90ae\u4ef6\uff1a<\/strong>\u00a01007788887@qq.com<br \/>\n<a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-884\" src=\"http:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp\" alt=\"\" width=\"1290\" height=\"2317\" srcset=\"https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp 1290w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-167x300.webp 167w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-570x1024.webp 570w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-768x1379.webp 768w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-855x1536.webp 855w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-1140x2048.webp 1140w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-7x12.webp 7w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-416x747.webp 416w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u6cd5\u5170\u9762\u7c7b\u578b\u8bf4\u660e \u6cd5\u5170\u9762\uff08\u5bc6\u5c01\u9762\uff09\u662f\u5f62\u6210\u65e0\u6cc4\u6f0f\u63a5\u5934\u7684\u5173\u952e\u3002\u4e0d\u540c\u7684\u6cd5\u5170\u9762\u7c7b\u578b\u9002\u7528\u4e8e\u7279\u5b9a\u7684\u538b\u529b\u8303\u56f4\u3001\u6e29\u5ea6\u548c\u5bc6\u5c01\u8981\u6c42\u3002\u51f8\u9762 (RF) \u6700\u5e38\u89c1\u7684\u7c7b\u578b \u51f8\u8d77\u7684\u5bc6\u5c01\u9762\uff081.6 \u6beb\u7c73\u6216 6.4 \u6beb\u7c73\u9ad8\u5ea6\uff09 \u540c\u5fc3\u6216\u87ba\u65cb\u952f\u9f7f\uff0c\u7528\u4e8e\u5939\u7d27\u57ab\u7247 \u9002\u7528\u4e8e 150-2500 \u7ea7 \u4e0e [...] \u4e00\u8d77\u4f7f\u7528<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[71,66,88,92,91],"class_list":["post-1014","post","type-post","status-publish","format-standard","hentry","category-blog","tag-facing","tag-flange","tag-gasket","tag-raised","tag-rtj"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/posts\/1014","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/comments?post=1014"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/posts\/1014\/revisions"}],"predecessor-version":[{"id":1019,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/posts\/1014\/revisions\/1019"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/media?parent=1014"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/categories?post=1014"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/zh\/wp-json\/wp\/v2\/tags?post=1014"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}